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How to connect the alarm sensor

NC means normal close, NO means normal open. You can choose different trigger mode depend on your alarm devices.

Choose the alarm sensor device that you want to use.

Use the two wires from the alarm sensor device connected to the I/O points from the indoor monitor. (Take IT82 as an example.)

If the alarm sensor is in Zone1, connect the alarm sensor’s two wires to the indoor monitor’s IO1 point and GND point separately.

You can find how to configure arming mode and status from this article